
The answer very much depends on cultural and local norms. A quick survey among the ISRAEL21c editorial team revealed our suspicion that Israel is a unique case, so to save you any future confusion and embarrassment, we’ve compiled the most comprehensive guide we could think of.
Of course, it’s not written in stone, so we recommend that you use your discretion at all times. If in doubt, err on the generous side. And let us know if we’ve missed someon